Method and apparatus for optically measuring properties of a mov

Details Method and apparatus for optically measuring properties of a mov Method and apparatus for optically measuring properties of a mov

1998-07-14

1999-11-23

Kim, Robert H.

Optics: measuring and testing

By monitoring of webs or thread

356430, G01N 2184

Patent

active

059910461

ABSTRACT:
The invention relates to a method and apparatus for measuring and controlling optical properties of a moving web. Sensor heads are installed in the same location on the opposite sides of the web to be measured so that there is at least one means of illuminating the web and at least one means of detecting radiances on both sides of the web. At least one means of illuminating the web of at least one side is controlled so as to provide at least two different lighting states. Measuring the values in different lighting states with both means of detecting radiances simultaneously allows determination the optical properties of the web on its both sides.

REFERENCES:
patent: 4389575 (1983-06-01), Cole
patent: 4565444 (1986-01-01), Mactaggart
patent: 4737649 (1988-04-01), Naruse
patent: 4801809 (1989-01-01), Burk et al.
patent: 5377279 (1994-12-01), Hanafusa et al.

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